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i have been looking around online for some new wheels. i found some rota g forces online. they are 17x8 et48 with a 56.1 mm bore. i was unsure what the bore means so i started looking on here. now i couldnt find what that meant but i found that a 56.1mm bore would be a correct fitting one for my04 wrx. but i am still wanting to know what the wheel bore is. could some1 please explaing what it is.

The center of the Hub (On the car) has a raised lip...The wheel has to have a large enough hole in the center to clear this lip.

Ideally the center bore of the wheel should match the size of the hub (As it does in your case, with the Rotas) to aid in centering the wheel on the hub. Some wheels have a Larger bore..so you use a hubcentric ring to help center the wheel.

The centerbore of a wheel is the machined opening on the back of the wheel that centers the wheel properly on the hub of a vehicle. This hole is machined to exactly match the hub so the wheels are precisely positioned as the lug hardware is torqued down. Keeping the wheel precisely centered on the hub when it is mounted will minimize the chance of a vibration. Some wheels are vehicle model specific and will come from the factory with a bore machined to match that vehicle. Some wheels are designed to fit multiple vehicle models and will use a centering ring system to reduce the bore size to match the hubs of different vehicles. These rings keep the wheel precisely positioned as the lug hardware is torqued down.

Some wheels are non-hubcentric by design. These are known as lug-centric wheels. With these wheels it is critical to torque the lug hardware with the vehicle on jack stands, off the ground. This allows the nuts or bolts to center the wheel and torque down without the weight of the vehicle pushing them off center.